<template>
    <el-container class="home-container">
        <!-- 头部 -->
    <el-header>
        <div>
            <img src="../assets/heima.png" alt="">
            <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button> </el-header>
    <!-- 页面主体 -->
    <el-container>
        <!-- 页面侧边栏 -->
        <el-aside :width="isCollapse ? '64px':'200px'">
            <!-- 展开区域 -->
            <div class="toggle-button" @click="toggleCollapse">|||</div>
            <!-- 侧边栏菜单区域 -->
             <el-menu  background-color="#333744" text-color="#fff" 
             active-text-color="#409eff" unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
      <!-- 一级菜单 -->
      <el-submenu :index="item.id +''" v-for="item in menuList" :key="item.id">
        <!-- 一级菜单的模板区域 -->
        <template slot="title">
            <!-- 图标 -->
          <i :class="iconsObj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>

        <!-- 二级菜单 -->
        <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" 
        :key="subItem.id" @click="saveNavState('/'+subItem.path)">
            <!-- 模板区域 -->
            <template slot="title">
            <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </template>
        </el-menu-item>
        
      </el-submenu>
    </el-menu>
        </el-aside>
        <el-main>
            <!-- 放一个welcome路由占位符 -->
            <router-view></router-view>
        </el-main>
    </el-container>
    </el-container>
</template>
<script>
    export default{
        data(){
            return{
                // 左侧菜单数据
                menuList:[],
                iconsObj:{
                    '125':'el-icon-s-custom',
                    '103':'el-icon-s-platform',
                    '101':'el-icon-s-goods',
                    '102':'el-icon-s-order',
                    '145':'el-icon-s-data'
                },
                // 是否折叠
                isCollapse:false,
                //被激活的链接地址 就是点击用户管理的时候向sessionstorage保存的地址
                activePath:''
            }
        },
        created(){
            this.getMenuList(),
            this.activePath = window.sessionStorage.getItem('activePath')
        },
        methods:{
            logout(){
                window.sessionStorage.clear();
                this.$router.push("/login");
            },
            async getMenuList(){
               const{data:res} = await this.$http.get('menus')
               if(res.meta.status !==200) return this.$message.error(res,meta.msg)
               this.menuList = res.data
               console.log(res);
            },
            // 点击展开收起菜单
            toggleCollapse(){
                this.isCollapse= !this.isCollapse
            },
            //保存链接的激活状态
            saveNavState(activePath){
                window.sessionStorage.setItem('activePath',activePath)
                this.activePath = activePath
            }
        }
    }
</script>

<style lang="less" scoped>
.el-header{
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0px;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div{
        display: flex;
        align-items: center;
        span{
            margin-left: 15px;
        }
    }
}
.el-aside{
    background-color: #333744;
    .el-menu{
        border-right: none;
    }
}
.el-container{
    background-color: #eaedf1;
}
.home-container{
    height: 100%;
}
.toggle-button{
    background-color: #4a5964;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>